package kr.hkit.powerjava.chapter25.chat;

public class QuizProtocol {
	private static final int WATTING = 0;
	private static final int PROBLEM = 1;
	private static final int ANSWER = 2;
	
	private static final int NUMPROBLEMS = 3;
	
	private int state = this.WATTING;
	private int currentProblem = 0;
	
	private String[] problems = {"네트워크 처리 패키지는? ", "자바의 최신버전은?", 
								"인터넷에서 컴퓨터를 식별하는 주소는? "};
	
	private String[] answers = {"java.io", "1.7", "IP 주소"};
	
	public String process(String theInput) {
		String theOutput = null;
		
		switch(state) {
			case QuizProtocol.WATTING:
				theOutput = "퀴즈를 시작합니다(y/n)";
				state = QuizProtocol.PROBLEM;
				break;
			case QuizProtocol.PROBLEM:
				if(theInput.equalsIgnoreCase("y")) {
					theOutput = problems[currentProblem];
					state = ANSWER;
				} else {
					state = WATTING;
					theOutput = "quit";
				}
				break;
			case QuizProtocol.ANSWER:
				if(theInput.equalsIgnoreCase(answers[currentProblem])) {
					theOutput = "정답입니다. 계속하시겠습니까? (y/n)";
					state = PROBLEM;
				} else {
					theOutput = "오답입니다. 계속하시겠습니까? (y/n)";
					state = PROBLEM;
				}
				currentProblem = (currentProblem+1)% NUMPROBLEMS;
				break;
		}
		return theOutput;
	}
}
